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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 yana_komarova 3185
#2 ryougi_shiki 2305
#3 FieryBanana101 2245
#4 anatolia 1770
#5 submarine 1700
Recent Solves
Modular Square Root veritas01
Favourite byte fatalfields
What's My Kernel dys4nt
Legendre Symbol veritas01
Finding Flags deejo
Recent Solutions
XOR Properties ThePigeonKing 0
Invariant ispo 0
Modular Binomials alienkeric 0
Encoding Challenge konnosT 0
Gotta Go Fast fssl 0

Level Up

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